Positive Displacement Pump: Working Principle, Performance, and Engineering Selection
A positive displacement pump moves a fixed volume of fluid per cycle, regardless of system pressure. That single design property — constant volumetric output independent of discharge pressure — explains why positive displacement (PD) pumps remain the standard choice for high-viscosity media, precise dosing, high-pressure low-flow duties, and any process where centrifugal pumps lose efficiency or fail to prime. At Aulank, we manufacture magnetic drive gear pumps and vane pumps in this category, and we've spent years matching pump types to operating conditions in chemical processing, semiconductor, new energy, pharmaceutical, and thermal management systems. This guide covers how PD pumps